Related papers: Fine structure splitting analysis of cavity-enhanced telecom-wavelength InAs quantum dots grown on a GaAs(111)A vicinal substrate

Fine structure splitting analysis of cavity-enhanced telecom-wavelength InAs quantum dots grown on a GaAs(111)A vicinal substrate

URL: http://arxiv.org/abs/2202.11436v2
Date: Fri, 30 Sep 2022 09:11:59 GMT
Title: Fine structure splitting analysis of cavity-enhanced telecom-wavelength InAs quantum dots grown on a GaAs(111)A vicinal substrate
Authors: Andrea Barbiero, Artur Tuktamyshev, Geoffrey Pirard, Jan Huwer, Tina M\"uller, R. Mark Stevenson, Sergio Bietti, Stefano Vichi, Alexey Fedorov, Gabriel Bester, Stefano Sanguinetti and Andrew J. Shields
Abstract summary: Entangled light can be generated by solid state quantum emitters with naturally low fine structure splitting. We present droplet epitaxy of telecom-wavelength InAs QDs within an optical cavity on a vicinal (2deg miscut) GaAs(111)A substrate.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: The effcient generation of entangled photons at telecom wavelength is crucial for the success of many quantum communication protocols and the development of fiber-based quantum networks. Entangled light can be generated by solid state quantum emitters with naturally low fine structure splitting, such as highly symmetric InAs quantum dots (QDs) grown on (111)-oriented surfaces. Incorporating this kind of QDs into optical cavities is critical to achieve sufficient signal intensitiesfor applications, but has so far shown major complications. In this work we present droplet epitaxy of telecom-wavelength InAs QDs within an optical cavity on a vicinal (2{\deg} miscut) GaAs(111)A substrate. We show a remarkable enhancement of the photon extraction efficiency compared to previous reports together with a reduction of the density that facilitates the isolation of single spectral lines. Moreover, we characterise the exciton fine structure splitting and employ numerical simulations under the framework of the empirical pseudopotential and configuration interaction methods to study the impact of the miscut on the optical properties of the QDs. We demonstrate that the presence of miscut steps influences the polarisation of the excitonic states and introduces a preferential orientation in the $C_{3v}$ symmetry of the surface.

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